I’d suggest taking a look at this section of the manual https://files.ettus.com/manual/page_usrp_x4xx.html#x440_usage_mcrs and the link Marcus sent https://kb.ettus.com/About_Sampling_Rates_and_Master_Clock_Rates_for_the_USRP_X440. This is a unique USRP architecture that requires some frequency and clock planning
You should probably manually set your desired Master Clock Rate (MCR) and Converter Rate (Fc) based on your frequencies of interest. It’s important to note that the X440 has no analog front end, so you cannot adjust any analog bandwidth filters, but you can reduce the MCR and Fc which will reduce the bandwidth digitally, and DDC will further reduce the bandwidth. You can set these clocks in the device arguments. So basically, if you set rx_rate=100e6, you’ll be getting 100 MHz of bandwidth, but where in the spectrum that 100 MHz is located and how many aliases you’ll see is decided by how you configure the clocks and what you set the RF center frequency to. Your timeout error is probably caused by running UHD programs on the X440 itself. It’s really designed to stream samples to it from a different host computer over the QSFP ports On Fri, Feb 7, 2025 at 8:44 AM Rilbert Lima via USRP-users < usrp-users@lists.ettus.com> wrote: > Thank you, Chris. > > I have updated the FPGA image from the USRP X440 to the X4_200, and upon > executing, the sampling rate has been reduced to approximately 5 Msps. > > Another matter I would like to inquire about is whether it is possible to > reduce the analog bandwidth of the signal from 200 MHz to 100 MHz. I am > aiming to use the X440 with OpenAirInterface5G in FR1, but since the image > is from the X4_200, which is tied to a 200 MHz bandwidth, I would like to > know if there is any workaround to perform this downgrade." > > However, in some tests that were performed, the receive timeout error > appears, even using the 5e6 sampling rate, increasing the value to 99 *Num > timeouts (Rx): 99*. And I don't know why these receive errors appeared. > > > root@ni-x4xx-342597F:/usr/lib/uhd/examples# ./benchmark_rate --rx_rate > 5e6 --tx_rate 5e6 > > [INFO] [UHD] linux; GNU C++ version 11.4.0; Boost_107800; > UHD_4.7.0.0-0-ga5ed1872 > > [00:00:00.029460] Creating the usrp device with: ... > > [INFO] [MPMD] Initializing 1 device(s) in parallel with args: > mgmt_addr=127.0.0.1,type=x4xx,product=x440,serial=342597F,name=ni-x4xx-342597F,fpga=X4_200,claimed=False > > [WARNING] [MPM.RPCServer] A timeout event occured! > > [INFO] [MPM.PeriphManager] init() called with device args > `fpga=X4_200,mgmt_addr=127.0.0.1,name=ni-x4xx-342597F,product=x440,clock_source=internal,time_source=internal,initializing=True'. > > Using Device: Single USRP: > > Device: X400-Series Device > > Mboard 0: x440 > > RX Channel: 0 > > RX DSP: 0 > > RX Dboard: A > > RX Subdev: 0 > > RX Channel: 1 > > RX DSP: 1 > > RX Dboard: A > > RX Subdev: 1 > > RX Channel: 2 > > RX DSP: 2 > > RX Dboard: A > > RX Subdev: 2 > > RX Channel: 3 > > RX DSP: 3 > > RX Dboard: A > > RX Subdev: 3 > > RX Channel: 4 > > RX DSP: 4 > > RX Dboard: B > > RX Subdev: 0 > > RX Channel: 5 > > RX DSP: 5 > > RX Dboard: B > > RX Subdev: 1 > > RX Channel: 6 > > RX DSP: 6 > > RX Dboard: B > > RX Subdev: 2 > > RX Channel: 7 > > RX DSP: 7 > > RX Dboard: B > > RX Subdev: 3 > > TX Channel: 0 > > TX DSP: 0 > > TX Dboard: A > > TX Subdev: 0 > > TX Channel: 1 > > TX DSP: 1 > > TX Dboard: A > > TX Subdev: 1 > > TX Channel: 2 > > TX DSP: 2 > > TX Dboard: A > > TX Subdev: 2 > > TX Channel: 3 > > TX DSP: 3 > > TX Dboard: A > > TX Subdev: 3 > > TX Channel: 4 > > TX DSP: 4 > > TX Dboard: B > > TX Subdev: 0 > > TX Channel: 5 > > TX DSP: 5 > > TX Dboard: B > > TX Subdev: 1 > > TX Channel: 6 > > TX DSP: 6 > > TX Dboard: B > > TX Subdev: 2 > > TX Channel: 7 > > TX DSP: 7 > > TX Dboard: B > > TX Subdev: 3 > > [00:00:04.112276974] Setting device timestamp to 0... > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#0] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DDC#1] The requested decimation is odd; the user should > expect passband CIC rolloff. > > Select an even decimation to ensure that a halfband filter is enabled. > > Decimations factorable by 4 will enable 2 halfbands, those factorable by 8 > will enable 3 halfbands. > > decimation = dsp_rate/samp_rate -> 49 > > [WARNING] [MULTI_USRP] Could not set RX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [00:00:04.465504150] Testing receive rate 5.015510 Msps on 1 channels > > [WARNING] [0/DUC#0] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#0] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#0] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#0] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#1] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#1] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#1] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > [WARNING] [0/DUC#1] The requested interpolation is odd; the user should > expect passband CIC rolloff. > > Select an even interpolation to ensure that a halfband filter is enabled. > > [WARNING] [MULTI_USRP] Could not set TX rate to 5.000 MHz. Actual rate is > 5.016 MHz > > Setting TX spp to 352 > > [00:00:04.801908845] Testing transmit rate 5.015510 Msps on 1 channels > > [00:00:14.826000429] Benchmark complete. > > Benchmark rate summary: > > Num received samples: 50161056 > > Num dropped samples: 0 > > Num overruns detected: 0 > > Num transmitted samples: 50201888 > > Num sequence errors (Tx): 0 > > Num sequence errors (Rx): 0 > > Num underruns detected: 0 > > Num late commands: 0 > > Num timeouts (Tx): 0 > > Num timeouts (Rx): 0 > > Done! > _______________________________________________ > USRP-users mailing list -- usrp-users@lists.ettus.com > To unsubscribe send an email to usrp-users-le...@lists.ettus.com >
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